Waves and Instabilities in Accretion Disks: MHD Spectroscopic Analysis

Details Waves and Instabilities in Accretion Disks: MHD Spectroscopic Analysis Waves and Instabilities in Accretion Disks: MHD Spectroscopic Analysis

2002-03-14

arxiv.org/abs/astro-ph/0203237v1

Astronomy and Astrophysics

Astrophysics

FOM-Institute for plasma physics "Rijnhuizen", Nieuwegein, the Netherlands 12 pages, 3 figures, Accepted for publication in Ap

Scientific paper

10.1086/340666

A complete analytical and numerical treatment of all magnetohydrodynamic waves and instabilities for radially stratified, magnetized accretion disks is presented. The instabilities are a possible source of anomalous transport. While recovering results on known hydrodynamicand both weak- and strong-field magnetohydrodynamic perturbations, the full magnetohydrodynamic spectra for a realistic accretion disk model demonstrates a much richer variety of instabilities accessible to the plasma than previously realized. We show that both weakly and strongly magnetized accretion disks are prone to strong non-axisymmetric instabilities.The ability to characterize all waves arising in accretion disks holds great promise for magnetohydrodynamic spectroscopic analysis.

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